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Date: Wed, 13 Jul 2022 23:38:33 +0900
From: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
To: "'cygwin AT cygwin DOT com'" <cygwin AT cygwin DOT com>
Subject: Re: scp command fails to transfer file and returns 1.
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On Wed, 13 Jul 2022 07:41:25 +0000
> Cygwin$B%5%]!<%H(B $B$4C4EvMM(B
> 
> $B$*@$OC$K$J$C$F$*$j$^$9!#(B
> $BD@!!%F%$$G$9!#(B
> 
> $B2<5-$NLdBj$N2r7h$K$D$$$F!"$46(NO$r$*4j$$$7$^$9!#(B
> 
> $B"#4D6-(B
>   OS: Windows Server 2019
> $B!!(BCygwin$B%P!<%8%g%s(B: 3.3.5
> 
> $B"#LdBj$,5/$-$?GX7J(B
> $B!!EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`$G$O!"%j%b!<%H%7%9%F%`(B(OS: Linux)$B$X(B
> $B!!(BSSH$BDL?.$d%U%!%$%kE>Aw$r9T$&L\E*$G!"(BCygwin$B$K4^$^$l$k(Bssh, scp$B%3%^%s%I$r(B
> $B!!;R%W%m%;%9$H$7$F<B9T$9$k<BAu$K$7$F$$$^$9!#(B
> $B!!"(<B>ZFbMF$N>\:Y$O!"(B"$B"#EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`(B"$B$r;2>H(B
> $B!!"(;vA0=`Hw$H$7$F!"(BSSH$B8x3+80$r AT _Dj$7!"%Q%9%o!<%I$NLd$$9g$o$;L5$7$G(B
> $B!!!!(BSSH$B@\B3$G$-$k$3$H$r3NG'$7$F$$$^$9!#(B
> 
> $B"#LdBj$NFbMF(B
> $B!!(BURL(https://www.cygwin.com/)$B$+$i%@%&%s%m!<%I$7$?:G?7%P!<%8%g%s(B(3.3.5)$B$N(B
> $B!!(BCygwin$B$r(BOS$B$KF3F~$7$?8e!"EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`$r<B9T$9$k$H!"(B
> $B!!(Bscp$B%3%^%s%I$OKh2s!"La$jCM(B"1"$B$GI|5"$7!"%U%!%$%kE>Aw$,<:GT$7$^$9!#(B
> 
> $B!!EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`$r%G%P%C%/$7$?7k2L!"(B
> $B!!(Bscp$B%3%^%s%I$O2<5-$N%a%C%;!<%8$rJV5Q$7$F$$$^$7$?!#(B
> 
> $B!!(B/usr/bin/scp: dest open ""/tmp/a"": No such file or directory
> $B!!(B/usr/bin/scp: failed to upload file /cygdrive//C/test/a to "/tmp/a"
> 
> $B"#LdBj$NJdB-(B
> $B!!!&(Bscp$B%3%^%s%I$r!"EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`$+$i;R%W%m%;%9$H$7$F(B
> $B!!!!<B9T$9$k$N$G$O$J$/!"%3%^%s%I%W%m%s%W%H$d(BCygwin Bash Shell$B$+$iD>@\E*$K(B
> $B!!!!<B9T$7$?>l9g$O!"La$jCM(B"0"$B$GI|5"$7!"%U%!%$%kE>Aw$O AT  DOT 8y$7$^$9!#(B
> 
> $B!!!&5l%P!<%8%g%s(B(3.2.0)$B$N(BCygwin$B$rF1$8(BOS$B$KF3F~$7$?8e!"(B
> $B!!!!EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`$r<B9T$7$?>l9g$O!"(Bscp$B%3%^%s%I$O(B
> $B!!!!La$jCM(B"0"$B$GI|5"$7!"%U%!%$%kE>Aw$O AT  DOT 8y$7$^$9!#(B
> 
> $B!!0J>e$N$3$H$+$i!"2f!9$O!":G?7%P!<%8%g%s(B(3.3.5)$B$H5l%P!<%8%g%s(B(3.2.0)$B$N(B
> $B!!(BCygwin$B$G!"(Bscp$B%3%^%s%I$NF0:n;EMM$K2?$i$+$NHs8_49$,$"$k$N$G$O$J$$$+!"$H(B
> $B!!?dB,$7$F$$$^$9!#(B
> 
> $B"#0MMj;v9`(B
> $B!!>e5-$NLdBj$KBP$7$F!"9M$($i$l$k860x$*$h$SBP=hJ}K!$O$"$j$^$9$+!)(B
> 
>   $B!c2sEz AT h!d(B
> $B!!!!(Bsoft-mpop-qqm AT ml DOT css DOT fujitsu DOT com
> 
> $B"#EvJ}$N%"%W%j%1!<%7%g%s%W%m%0%i%`(B
> $B!!!&;R%W%m%;%9$N<B9TJ}K!(B
> $B!!!!(BWindows API$B$N(BCreateProcess()$B$r0J2<$NMM$K;HMQ$7!";R%W%m%;%9$r<B9T$7$^$9!#(B
> 
>  $B!!(BCreateProcess(NULL, 
>         fullPathCmd,$B!!!!(B/* ssh,scp$B$N(Bcommond line                     */
>         NULL,           /* process security attributes              */
>         NULL,           /* primary thread security attributes       */
>         TRUE,           /* handles are inherited                    */
>         NORMAL_PRIORITY_CLASS|CREATE_NO_WINDOW,  /* creation flags  */
>         NULL,           /* use parent's environment                 */
>         NULL,           /* use parent's current directory           */
>         &si,            /* STARTUPINFO pointer                      */
>         &pi);           /* receives PROCESS_INFORMATION             */
> 
> $B!!!&(Bssh$B%3%^%s%I$r<B9T$9$k;~$N%3%^%s%I%i%$%s(B
> $B!!!!>e5-$K<($7$?(BCreateProcess()$B$NBh#2%Q%i%a%?(BfullPathCmd$B$r!"0J2<$NMM$K(B
> $B!!!!;XDj$7$F$$$^$9!#(B
> 
> $B!!!!(B<Cygwin$B$N%$%s%9%H!<%k%G%#%l%/%H%j(B>\bin\ssh.exe -q -l root -p 22 $B%[%9%HL>(B "echo aaa && /bin/sh -c \"/bin/uname -n\""
> 
> $B!!!&(Bscp$B%3%^%s%I$r<B9T$9$k;~$N%3%^%s%I%i%$%s(B
> $B!!!!>e5-$K<($7$?(BCreateProcess()$B$NBh#2%Q%i%a%?(BfullPathCmd$B$r!"0J2<$NMM$K(B
> $B!!!!;XDj$7$F$$$^$9!#(B
> $B!!!!(B
> $B!!!!(B<Cygwin$B$N%$%s%9%H!<%k%G%#%l%/%H%j(B>\bin\scp.exe "/cygdrive//C/test/a" "root"@$B%[%9%HL>(B:""/tmp/a""
> 
> 
> $B0J>e!"$h$m$7$/$*4j$$$7$^$9!#(B
> 
> 
> $B0J9_$O1QLuJ8>O$G$9!#(B
> ******************************************************************
> Cygwin Support Dear Representatives
> 
> Thank you for your support.
> I am Shen Ting.
> 
> We ask for your cooperation in solving the following problem.
> 
> $B"#(BEnvironment
>   OS: Windows Server 2019
> $B!!(BCygwin Version : 3.3.5
> 
> $B"#(BBackground of the problem
> In our application program, for the purpose of SSH communication and file transfer to a remote system (OS: Linux), 
> the ssh and scp commands included in Cygwin are executed as child processes.
> (*) For details of the demonstration contents, refer to "$B"#(BOur Application Program"
> (*)As a preliminary preparation, we set the SSH public key and 
>    confirm that we can connect to SSH without inquiring about the password.
> 
> $B"#(BThe problem
> In the OS, after installing the latest version (3.3.5) of Cygwin downloaded from the URL(https://www.cygwin.com/), 
> when we execute our application program, the scp command returns "1" every time, and the file transfer fails.
> 
> As a result of debugging our application program, the scp command returned the following message.
> 
> $B!!(B/usr/bin/scp: dest open ""/tmp/a"": No such file or directory
> $B!!(B/usr/bin/scp: failed to upload file /cygdrive//C/test/a to "/tmp/a"
> 
> $B"#(BProblem supplement
> $B!&(BIf the scp command is executed directly from the command prompt or Cygwin Bash Shell
>   instead of being executed from our application program as a child process, 
>   "0" will be returned and the file transfer will succeed.
> 
> $B!&(BIf we execute our application program after introducing the old version Cygwin(3.2.0) to the same OS, 
>   the scp command will return "0" and the file transfer will be successful.
> 
> From the above, we speculate that there may be some incompatibility in the operating specifications of 
> the scp command in the latest version Cygwin(3.3.5) and the old version Cygwin(3.2.0).
> 
> $B"#(BRequests
>   Are there any possible causes and workarounds for the above problem?
> 
>   <Respondents>
>    soft-mpop-qqm AT ml DOT css DOT fujitsu DOT com
> 
> $B"#(BOur Application Program
> $B!&(BHow child processes run
>   Use the Windows API CreateProcess() as follows to execute the child process.
> 
>  $B!!(BCreateProcess(NULL, 
>         fullPathCmd,$B!!!!(B/* ssh,scp$B$N(Bcommond line                    */
>         NULL,           /* process security attributes              */
>         NULL,           /* primary thread security attributes       */
>         TRUE,           /* handles are inherited                    */
>         NORMAL_PRIORITY_CLASS|CREATE_NO_WINDOW,  /* creation flags  */
>         NULL,           /* use parent's environment                 */
>         NULL,           /* use parent's current directory           */
>         &si,            /* STARTUPINFO pointer                      */
>         &pi);           /* receives PROCESS_INFORMATION             */
> 
> $B!&(BCommand line when executing ssh command
>   The second parameter of CreateProcess() shown above, fullPathCmd, is specified as follows.
>  
>    <Cygwin Installation Directory>\bin\ssh.exe -q -l root -p 22 $B%[%9%HL>(B "echo aaa && /bin/sh -c \"/bin/uname -n\""
> 
> $B!&(BCommand line when executing scp command
>   The second parameter of CreateProcess() shown above, fullPathCmd, is specified as follows.
>  
>    <Cygwin Installation Directory>\bin\scp.exe "/cygdrive//C/test/a" "root"@$B%[%9%HL>(B:""/tmp/a""

I cannot reproduce your problem. Could you please provide
simple test case in C-lang?


-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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